Hank

Despite his menial job Hank is actually a mathematical genius surpassing even Gretchen. However he prefers to treat it exclusively as a hobby (this is seen in the episode "A Genius Among Us", which has a plot resembling that of the film Good Will Hunting). In "To Finster with Love", Hank and Ms. Finster fall in love with each other and date for a brief period before parting on good terms. They thought it was separating them from their jobs at the school.